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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd9ed6806c1bb0b5ddcb1319c07815da08bf9c39f37d71d9a13878579e97a33' 
  AND token = 'O1vhmUTqn3W6YfrIIhojYQQKHzXLKHKWAYFP/aN/6IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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