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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e2fc23ea69bf02e8bc626783f17f883062f874b979edc805f00aa3af0525140' 
  AND token = 'tdjIRllbH2ey7f11ppu9KqNRA9rkG3b1SLnO5lQTS2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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