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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be5a291140ea9dfea1dad9a9ece5d1a627a3dbe32d008965250887253e15658' 
  AND token = 'ab28MRfHJ0sDWQwRkV8y5QxQX91o1a1H9XhcWTvjvaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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