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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a41259fa1b1b456239d1bec70b6fb97212ff49da562f32e4b0d306a72c09634b' 
  AND token = 'HnQor/y1WaBHgKxy4LeBkfAHUjxc/Dm/9Q9X6v1Z6pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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