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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eeb6bfb99c16549c0f054c79090e9f82362fa4f92861d1c15d36a9238c65984' 
  AND token = 'ZAPIZ9/mxT9ySnoHm+QgOPUbzK9ZTlzWf4ywA8Wlw1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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