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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41fb350a75aa25535df8d9285d1575c040afb6a57f92db7e7c236639919b810e' 
  AND token = 'PdbVvioQIrFF06bITmn991jsZAHHDw588rui0nCt+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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