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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdadcedb5b2bfeb2349f02cfe2eaa5bf0f9a8e37647c03c971d57e1843e25191' 
  AND token = 'Su4OOfzxBBdEdWO1zsfiHBz3q5SOzePvbiUlzqeiSwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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