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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '909887deeb8b9f2507586c4299e6f62b2ba0126f94ea20b263c66bfdb27361a0' 
  AND token = 'N1U+eXPxH+iTPSl2YDTt8j/5y3vYi0twWXKH8cSq+Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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