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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '119e3833fa0f0240a63d9792bfcc7eecc64b69a0c2db490bba5131be040088a5' 
  AND token = 'L8TTcGAzjWxgfShizlawav+NJEfcj96L80oHfK8eX24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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