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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2553c302f00d0c9f9f5c8855e6de639f4f55c29348b2a67c1d4397a6c1bd46ad' 
  AND token = 'fLBTExyXndjuN/Mm2vseLxyE1CTS0x/tVZB6jXkL36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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