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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bba1c887808903554fd36fb3df9d2f707f5cb32d8cdad5e4f65e831821d20ecc' 
  AND token = 'jzztFWAy5Xt7gb111gyeyRGdLs4AiSALxPw/cDdCHAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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