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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84ee02e0c050eff84de5b6acac43bcff5e77b0d58c393535eae5d88e3ab0c100' 
  AND token = '7m6U4SjbHDs4aeM8arua5SZ6MZcR60WP7m3tFqWuSRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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