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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bf9c11ea2696aad54972e6fc5f791a842efe939393f06ef66281b2f3b79f6de' 
  AND token = '1yHyd/QMe4+82fTQ7lQ0fjYyfDCG1hSCIZAe9JfmPnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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