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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2918fcb86fda69e49f525fd8c566680a01301d49e9f3b2238b378d6904daab4' 
  AND token = 'FfVwSR9CklaNko06uU+UzWGRTUjHVNPP+K9XtMEp1E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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