SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078691686ccef5ff12d665e555d97ec38f6a27e28c462dfa65490cb12b3c996a' 
  AND token = 'mwa7C+jtOMP4xKY4uXgI7Yz50bS1wHmv4bZxqjAl1Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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