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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8099a5d7944ea31592273252fa9d41bc1590c1cc93baef0b68baf230ce097a38' 
  AND token = '4qWIuvEYwdLDNFAArTmnQ5xNOZUyT+JW6dF0rLk8ksM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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