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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec8e52323c9030bbcf72724649ebccb09f12def056085bdfde4a736e7c39cd97' 
  AND token = 'WMnL/3IXWhpWeFI0KUrfUvM2153DddQ6SI+tIHKo9FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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