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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0206fbf7b9ef8622d3042c58dcd0270dc650bbc14c3ff7de442ad908041b56d9' 
  AND token = 'Fa2zaH5NONE4T0KCtPABpdyxNW7+MK8xfjbkGmlohgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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