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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ea00aaef83cfdb4ebe8e649119792cf0c613b9e9839f147441776982d3a59c' 
  AND token = 'WTNTWnSB/6mLHsm2ntPT8p+OD1h28kxPZyKDzb0RZPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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