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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93c8b51064b7cd1d77e1a8a20327c72c0addd540a73a22c0f0b782f44df84daf' 
  AND token = 'mWC4vgUUwr7jI6KinaOvuU3AUmL4Dkbe1jApiBo+No0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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