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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a399c8b507a3c71a51cf3f014fa9ddfc0ad80ca19d959488db15dfc459989d' 
  AND token = '6yXmguaTbFkpHQhyujXEuJqCJ4JEKs67GIJtSPc1/PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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