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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d94d1e5ff324f41f4ccff780528a0f610de09c19648f20e7dd08f2fdcc81e17' 
  AND token = '2kJRe1BM/8KZ15ZpkuuJJs7YtU+yZl7Yx/H/QXC1wko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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