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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f16d49055fab3d1f704235c4accec06f055d6506fa2bffdfbfabff628d7ee02e' 
  AND token = '0xANVN4netZyd5kxdZ2LNczck2ILQV/Xbm3yPyqn17A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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