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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eef21b7e9a0c30c92eb3252acb4fab34be051e254f866e2e6c4b18ce002b2e6e' 
  AND token = 'eCTkEM/znfwiBdKJoF7fpxR7R8t11T9EF6vezCxDS7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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