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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8340159bfd0bc471a0830997a5ef33b4a6ac18abc2d944dda6dabfbee6fb8a1a' 
  AND token = 'jLgBJlqH28ZD2WF5SNHC6g6NeIFdf37RLZOnp02+pNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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