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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aa62c8014b0a2e54b1c72bd3f987b488917e67eee85182389892bba79127d55' 
  AND token = 'g8r6ygYx8Sdzd3Hj0Wml9GjYjEwVwQFXVuP4tqE7NF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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