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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '552c1bc72a60a090e63e87639be60e6f4dc782a86ed391a92995b1cf75cfe730' 
  AND token = '1tLFhYtPhLDtTFfwUrp2hXnTf4Ddk/1htkMylH8doWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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