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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '135ceafee7466da712d3896eda1f7f154db3773e91ec966bd93502d0751c5db8' 
  AND token = '4EmoB0flf1zFoqd3Tqcp+HcP9hSz2qaFmNiQnHc9iG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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