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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2be217418f0d0c5f0af8a541fa65e3c885970bc1d096bda12949bf61c802d07' 
  AND token = 'eU+At7bQh6rkNUrjzaFh5Q5ohPokSi/Ms7XHuqSdlUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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