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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de4ba38547f570bd4ecaa29203fe1ff6f0b52fa603280e0f9e9e49dfce3e7bce' 
  AND token = '0tG4rME/QuENwx8UnHCMCxMP8Qty0a47/BAakCrxAOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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