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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e3eed9e5cceda9d9e1896e53f46b487f8e19e574545551ec667eb0d1645141e' 
  AND token = '1HkVeCLddkEtBDRs32afGomD+4VGDUMh6Xn/sx1lj8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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