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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7029a559430961e9ab39763b955bee0b1b8cf23b0e53aee24b423a8b4f8b571' 
  AND token = 'F8MsVeiPY7fP3BLMlD2zOauT2Su1Nbo35WHDor35cTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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