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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6fcf5b84e7f2a818b5dc9630f4f8c3acc46cb1366eb499b52f50c21685811aa' 
  AND token = 'iiRruCLHu6syTVy9RKFFdyxcbpqfLUfoN7dNHk5Pdc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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