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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ea4cda0156589291e7c44be0f3c9366ec1617e39de2cc14afa8219db1fe4177' 
  AND token = 'UuUrtNq8hPo2D3T3+FSmlWZdd5aCE4BnW6ukHmkm9Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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