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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90cc89d181d45842e5744e9b806b2ff1cd90aaedc4e4408511c9b3aacb77d141' 
  AND token = 'ZjfZRQFBnisuEj5U4g1VU3FdMnPDrAgo7gjhYo/5WFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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