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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd65d37254be1ff304c774d1a3d26005a9f21b7e0081a7b386b41c0057f44f0cc' 
  AND token = 'Mju/u+Ho8HlUyAG2VxnWu+1bSluGtoMa8jw23vWm+1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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