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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8d9d61ec0e72eef4c00f2a73c93410f2debe709301ea27287f09179e7fa40b9' 
  AND token = 'ZVcwR4YzVXDcslo/my3fQg4fW/Kp1JC9xzgHKNomr94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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