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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '248736505fa660c8d8438bc3aecc874a29acfe793a092deb1b880000bdb46ff3' 
  AND token = 'O0LYFj9rNbWaPEQRYncD5Nc1lGQCXz+zeST6rZfHp00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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