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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f034d2ba5ba5f6dcd48d685bac8807b10730f2b08a4fd147f7cdf6100d6d426' 
  AND token = 'VLifA0OAYbVJ9rIg1Qteock0SuI7TIVMrjatd25z+q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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