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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4281fa7bbea86c8042a24e6b2e809a0ebdd495cac5e51a385ab8847d31508a4e' 
  AND token = 'cc/hSKj9Yyxb+4ze8ZytAgfLJYcyKiQgavZZ7rWTJgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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