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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feefa7b6ae7f270e25faad80ab5a4a2f0b4b1ce5bfd75bb742d8c53432002b4a' 
  AND token = 'dCKlnGZthy51hqV5CK/bLlPKKN+3fX5CA4toTyc1mtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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