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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d0f385698a5dc0b8a694927dc618ecf7397acd185525e3b3ab99e0cf7bdaa0' 
  AND token = 'dWT0fT+80j9ffYpzcNxCAVxQ/idl1IvlMLv/5z0sOtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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