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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2c337e0bf37a3c7cb573cf7f975ae0c8f7f1f55bd2f40d618c069842ed1b0b2' 
  AND token = '1gF3QLOxrG8/m7li59iA5UI6eQAx6gwxw/FCSoEt/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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