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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61cdd41bce9d0c111e1ad1d33ca51f2551cc439e71acc3aebce82e725c733862' 
  AND token = '19OpBhxdDFEVQxTLob2clbmA5QpAgpm6sVEIb2VxhK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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