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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4d35cca1c2dda31a12d1113c925120478b4ab88fa931bce29a1272a7e64d55' 
  AND token = 'lHzkmmPARbyq56mP5oIMwUvli70zNT5AjPiqvUn1Ffc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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