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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dd17ce34a496d55c733a7120e23c7a67ae72cc5b9c4811e62c3b721088897ef' 
  AND token = 'IDudwqWomMkqjy3paFOlJTJpnT2FD9Vr8rbkxzaR7oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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