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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8ed29726e437a982c497bc937e9bf886d2d4a9ff51b103ecdc4b033842d134' 
  AND token = '8FoVmBpBsvNJ9aMb6Us+9+Jo/aELW4l6MbMMq36sTvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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