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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecd1ffb7bb57a03b4972dfadd5b66be99f966ad8eaf925787eca782e188d1d38' 
  AND token = 'GIe6Ij5H6GUO403Dy/u81mCeffnv0EekMXjiOT480Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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