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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bb7ce3aed95f1bea934065aa3eea2658cfd3a8832c17f13e9fc4e2969c16fe2' 
  AND token = 'MJ1uLECEjbRfSrApNvLsxJ4RA5qLrmKTxZdFfSWb8VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}