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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6584f6fcc7b1b43a06abe2f268072a881bd07a22f44dc72d867e71becd0c1e7' 
  AND token = 'VW50RvH4l0Tdd2ifaKVKfnjbG0NHd+3Ks78cB5iRcs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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