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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e43dba76de4b58661798a4d9ee25a9cbb6560c92f1b0052d27516b42d064539' 
  AND token = 'zhsLlf2hHGqQ1GOCCZuD7X17Irr4NnIs/doE4IHiyvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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